xkbcomp 1.4.0 has been released[1] and it contains a fix to ignore high keycodes (i.e. to not error and therefore crash the X11/Wayland session). This fix is needed to enable KEY_KEYBOARD (and KEY_FAVORITES), which are found on 2017 Lenovo laptops, to be mapped. [1] https://lists.x.org/archives/xorg-announce/2017-May/002797.html
xorg-x11-xkb-utils-7.7-19.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2017-833d1ff814
xorg-x11-xkb-utils-7.7-19.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-833d1ff814
xorg-x11-xkb-utils-7.7-19.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.